package com.neolix.watch.view;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

import com.neolix.watch.R;

public class SlipButton extends View implements OnTouchListener {
    public static final int PADDING = 7;
    private boolean NowChoose;// 记录当前按钮是否打开,true为打开,false为关闭

    private boolean isChecked;

    private boolean OnSlip = false;// 记录用户是否在滑动的变量

    private float DownX, NowX;// 按下时的x,当前的x

    private Rect Btn_On, Btn_Off;// 打开和关闭状态下,游标的Rect .

    private boolean isChgLsnOn = false;

    private onChangedListener ChgLsn;

    private Bitmap bg_on, slip_btn_open;
    private Bitmap slip_btn_close;

    public SlipButton(Context context) {
        super(context);
        init();
    }

    public SlipButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public SlipButton(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {// 初始化

        bg_on = BitmapFactory.decodeResource(getResources(),
                R.drawable.bg_switch_track);

        slip_btn_open = BitmapFactory.decodeResource(getResources(),
                R.drawable.bg_switch_thumb_open);

        slip_btn_close = BitmapFactory.decodeResource(getResources(),
                R.drawable.bg_switch_thumb_close);

        Btn_Off = new Rect(0, 0, slip_btn_open.getWidth(), slip_btn_open.getHeight());

        Btn_On = new Rect(bg_on.getWidth() - slip_btn_close.getWidth(), 0,
                bg_on.getWidth(), slip_btn_close.getHeight());


        setOnTouchListener(this);// 设置监听器,也可以直接复写OnTouchEvent
    }

    @Override
    protected void onDraw(Canvas canvas) {// 绘图函数

        super.onDraw(canvas);

        Matrix matrix = new Matrix();
        Paint paint = new Paint();
        float x;

        canvas.drawBitmap(bg_on, matrix, paint);// 画出关闭时的背景

        if (OnSlip)// 是否是在滑动状态,
        {
            if (NowX >= bg_on.getWidth())// 是否划出指定范围,不能让游标跑到外头,必须做这个判断

                x = bg_on.getWidth() - slip_btn_open.getWidth() / 2;// 减去游标1/2的长度...

            else if (NowX < 0) {
                x = 0;
            } else {
                x = NowX - slip_btn_open.getWidth() / 2;
            }
        } else {// 非滑动状态

            if (NowChoose)// 根据现在的开关状态设置画游标的位置
            {
                x = Btn_On.left;
            } else
                x = Btn_Off.left;
        }

        if (x < 0)// 对游标位置进行异常判断...
            x = 0;
        else if (x > bg_on.getWidth() - slip_btn_open.getWidth())
            x = bg_on.getWidth() - slip_btn_open.getWidth();

        if (x < (bg_on.getWidth() / 2))
            canvas.drawBitmap(slip_btn_close, x += PADDING, (bg_on.getHeight() - slip_btn_close.getHeight()) / 2, paint);// 画出游标.
        else
            canvas.drawBitmap(slip_btn_open, x -= PADDING, (bg_on.getHeight() - slip_btn_close.getHeight()) / 2, paint);// 画出游标.

    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = MeasureSpec.getSize(heightMeasureSpec);

        setMeasuredDimension(bg_on.getWidth(), bg_on.getHeight());
    }

    public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_MOVE:// 滑动
                NowX = event.getX();
                break;

            case MotionEvent.ACTION_DOWN:// 按下

                if (event.getX() > bg_on.getWidth()
                        || event.getY() > bg_on.getHeight())
                    return false;
                OnSlip = true;
                DownX = event.getX();
                NowX = DownX;
                break;

            case MotionEvent.ACTION_CANCEL: // 移到控件外部

                OnSlip = false;
                boolean choose = NowChoose;
                if (NowX >= (bg_on.getWidth() / 2)) {
                    NowX = bg_on.getWidth() - slip_btn_open.getWidth() / 2;
                    NowChoose = true;
                } else {
                    NowX = NowX - slip_btn_open.getWidth() / 2;
                    NowChoose = false;
                }
                if (isChgLsnOn && (choose != NowChoose)) // 如果设置了监听器,就调用其方法..
                    ChgLsn.nnChanged(NowChoose);
                break;
            case MotionEvent.ACTION_UP:// 松开

                OnSlip = false;
                boolean LastChoose = NowChoose;

                if (event.getX() >= (bg_on.getWidth() / 2)) {
                    NowX = bg_on.getWidth() - slip_btn_open.getWidth() / 2;
                    NowChoose = true;
                } else {
                    NowX = NowX - slip_btn_open.getWidth() / 2;
                    NowChoose = false;
                }

                if (isChgLsnOn && (LastChoose != NowChoose)) // 如果设置了监听器,就调用其方法..

                    ChgLsn.nnChanged(NowChoose);
                break;
            default:
        }
        invalidate();// 重画控件
        return true;
    }

    public void setOnChangedListener(onChangedListener l) {// 设置监听器,当状态修改的时候
        isChgLsnOn = true;
        ChgLsn = l;
    }

    public interface onChangedListener {
        abstract void nnChanged(boolean checkState);
    }

    public void setCheck(boolean isChecked) {
        this.isChecked = isChecked;
        NowChoose = isChecked;
        invalidate();
    }
}
